Covering for furnace combustion chambers



M y 1933- G. c. MCCORMICK COVERING FOR FURNACE COMBUSTION CHAMBERS 2 Sheets-Sheet 1 Filed May 6, 1951 J? a 30 .az

ATTORNEYS y 30, 1933- cs. c. M coRMlK I COVERING FOR FURNACE COMBUSTION CHAMBERS Filed May 6, 1931 2 Sheets-Sheet 2 Patented May 30, 1933 UNITED STATES PATENT, OFFICE VGEORGEI c. MCCORMICK, or nnnnnnn, MASSACHUSETTS, nssreivon ro GENERA ALLOYS COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSA CHUSETTS Application filed May 6, 1931. Serial No.-535,478.

My invention relates to a metallic covering above the hearth or combustion chamber of a furnace against which the flame of an oil burner or any other means of combustion may be applied which is used in heating,

for example, boilers, rotary retorts and kilns. Heretofore combustion chambers of the above type have been covered with carborundum plates in order to protect the boiler from injury from direct impingement of flame thereon but such plates are objectionable due to cost, slow and ineiiicient heat transfer and other causes.

I provide a covering for such furnace combustion chambers of corrosion resisting alloy metal sheets which are free from the objectionable features of the carborundum plates but which are subject to expansion and contraction due to the temperature changes of heating and cooling. 7

It is therefore one object of my invention to provide anchorage and holding means for the metal plate flooring which will permit any necessary movement due to expansion or contraction, and yet avoid permanent or progressive buckling, distortion and the like. a 7

Another object is to provide a-flooring the whole of which or any part of which may be replaced in a comparatively short time.

Other objects and. features of the invention will appear in the following description and drawings in which a preferred embodiment is shown.

In the drawings Figure 1 is a plan sectional view through a portion of a furnace showing the arrangement of the metallic sheets and means for holding same in place.

Fig. 2 is a-vertical cross sectional view through one combustion chamber of the furnace taken along the lines 22 of Fig. 1.

Fig. 3 is an enlarged cross section taken on the line 33 of Fig. 1 of the anchoring means.

Fig. 4 is an enlarged fragmentary plan section through a furnace with parts broken away. 7

Fig. is a vertical section taken on the lines 55 of Fig. 4 showing'the sheet anchoring-means and expansion joints.

Reference character 10 designates walls of material such as firebrick arranged in parallel relation with the combustion chambers 12 therebetween, which may. be heated in any suitable way, for example, by oil burners 1 1 projecting into the chambers at one end thereof; The top formation of walls 10, disposed between the heating chambers 12, is varied according to the form of the boiler or other object being heated. In the form shown the combustion chambers are arranged transversely for heating a-cylindrical boiler orw rotary retort as indicated at 16.

For this type of furnace I prefer to construct the walls 10 with a fiat horizontal upper surface 18, for a distance of substan tially one half the widthof the furnace, and the remaining surface of curved formation to coincide preferably with-theradius of the boiler 16. I

Metallic sheets 2224 of corrosion resisting alloy, are placed across the surface 182O of the partition walls 10, bridging the combustion chambers 12as shown in Figs. 1 and 2, one sheet 22 having a flanged edge26 which overlaps the end of the. adjoining sheet 24.

Within the top surfaces 1820 of thepartition walls 10 I provide preferablyrcentral longitudinal grooves ortroughs 28, and insert therein pairs of preferably cast inverted channel bars 30, 30, the downwardly extended side flanges 32 of which are slotted as shown at 34, to prevent distortion when heated. At one end, preferably the end nearer the burner, the channel bars are pivotally connected to anchor members 36 imbedded within the fire brick, while at the opposite end of said bars 30 an expansion joint is provided by pins 50 projecting upward from the channelbars 30-31, by which means the sheets are held in place against longitudinal movement,

and yet lateral expansion of said sheets is permissible. Y

A plurality of lugs 52 are secured to the upper surface of the channels 303O between ridges 56 formed integrally with the channel bars and providing pockets to receive the lugs 52. The free end of each lug 52 is offset at 58 and overlaps a portion of the metallic sheets 22-24 which prevents said sheets from raising or buckling. I

By this novel means of anchoring the channel bars, and securing the sheets by means of the lugs 52, fixed to said channel bars, all necessary expansion and contraction of any of the members is provided for. The replacement of any of the sheets may easily be made by removing the anchor pins in channels on one side of the metallic sheet which is to be removed, then raising said channels sufiiciently to permit the sheets to clear the lugs 52 secured to said channels. Replacements are thus easily made without disabling the furnace for any period of time.

Various alterations may be made without departing from the scope of my invention as defined in the following claims.

I claim:

1. In a combustion furnace, a plurality of transverse wall partitions spaced apart to provide a plurality of combustion chambers, metallic covering members supported by said wall partitions and covering said combustion chambers, and means for anchoring the covering members which permit same to expand and contract wlthout distortion upon heating and cooling.

2.- A structure as defined in claim 1 in which the anchoring means comprises a plurality ofinverted channel bars, having lugs attached thereto which overlap the covering members, said bars being disposed in channels ,within the partition wall, anchor members means of a pin and slot connection, thereby permitting longitudinal expansion.

4. A structure as defined in claim 1 in which the metallic covering members have slotted cars at one end thereof and pins secure the same to the anchoring means,

5. A structure as defined in claim 1 in Which the partition wall surface, metallic coverings and anchoring members are horizontal for substantially one half their length at the burner end and arcuate for the remainder of their length whereby the arouate portion is brought into close relationship with a cylindrical retort or boiler memher to be heated.

6. In a combustion furnace an elongated combustion chamber having a plurality of transverse partition walls dividing said chamber into-a plurality of individual combustion chambers a trough provided in the surface of each wall, pairs of inverted channel shaped anchoring members in said trough, anchor posts embedded within the wall portion, one end of each channel member being fixed to an anchor member while the opposite end thereof is loosely'anchor'ed by means of pin and slot connection, there by providing expansion'joints permitting longitudinal expansion, metallic sheets overlapping the surface of the wall portion at either side of the trough and covering the combustion area, said sheets being retained in set position by means of slotted ears in engagement with pins projecting from the surface of the channel members and by means of lugs secured to the surface of said channel members having projecting portions overlapping the edges of the metallic sheets.

7. In a combustion furnace, separated wall portions forming a combustion chamber space therebetween, a metallic plate supported by said wall portions and spanning said space, members secured to said wall portions at opposite margins of said plate, and

means on the members overlapping said plate.

8. In a combustion furnace, separated wall portions forming a combustion chamber space therebetween, a metallic plate supported by said wall portions and spanning said combustion chamber space, anchoring means embedded in said wall portions, and elongated members at opposite margins of said plate secured to said anchoring means so as to allow expansion and contraction of said members longitudinally, and prevent vertical bodily movement thereof, and means on said elongated members overlapping said plate to prevent buckling thereof.

9. In a combustion furnace, separated wall portions forming a combustion chamber space therebetween, a metallic plate resting on said wall portions and spanning said space, members secured to said wall portions at opposite margins of said plate, and means on said members for retalnmg the plate 1n position against buckling,said means coact ing with said plate to provide clearance allowing the expansion and contraction of the plate.

10. In a combustion furnace, separated wall portions forming a combustion chamber space therebetween, a metallic plate resting on said wall portions and spanning said space, elongated metallic members secured to said wall portions at opposite margins of said plate, and fingers secured to and dis posed along said elongated members, and overlapping said plate, said elongated members having means thereon to prevent displacement of said fingers.

11. In a combustion furnace, separated vertical wall portions forming a combustion chamber space therebetween, a metallic plate resting on said wall portions and spanning said space, elongated members secured to said wall portions at opposite margins of said plate, means for securin said plate to said elongated members, said means a1- lowing expansion and contraction of said plate, and means on said elongated members overlapping said plate to prevent the buckling thereof.

12. In a combustion furnace, separated 1 wall portions forming a combustion chamber space therebetween, a metallic plate on said wall portions spanning said space, and members anchored to said wall portions at opposite margins of said plate, and including means for securing said plate thereto, and means for preventing buckling of said plate, said several means coacting with said plate so as to allow expansion and contraction thereof.

13. In a combustion furnace, separated wall portions forming a combustion chamber space therebetween, a metallicplate on said wall portions at opposite sides of said plate, members having means for securing the same to said wall portions at opposite margins of said plate, said securing means including provision for allowing the expansion and contraction of said members, and means on the members for retaining said plate in position against buckling and including provision for allowing free expansion and contraction of said plate.

14:. In a combustion furnace, separated wall portions having channels therein, and forming a combustion chamber space therebetween, a metallic plate on said wall portions spanning said space, anchoring members embedded in said wall portions in said channels, inverted channel bars received in said channels, means securing the bars to said anchoring members so as to allow expansion and contraction of the bars, and lugs on the bars overlapping said plate to pre vent buckling thereof.

15. In a combustion furnace, separated wall portions having channels therein, and forming a combustion chamber space therebetween, a metallic plate on said wall por tion spanning said space, members secured within said, channels, means for securin said plate at one end tosaid members, an means on said members overlapping said 10 plate to prevent the buckling thereof, said several means allowing expansion and contraction of said plate.

In testimony whereof, I have signed my name hereto.

GEORGE G. MCCORMICK. 

